Amanda Culbertson and Jorge Wong sued last year, claiming they were retaliated against after exposing problems with the reliability of tests conducted in HPD's breath-alcohol testing vans.

Among other allegations, the lawsuit said officials with the district attorney's office lobbied the Harris County Commissioner's Court to cancel a contract with a local, private laboratory, where the two had found jobs after leaving HPD.

U.S. District Judge Lynn Hughes dismissed the lawsuit, saying Culbertson and Wong had not described facts that are recognized as a valid claim for a lawsuit, according to court records.